Automatic belt-shifter



R. MOTZNIK.

AUTOMATIC BELT SHIFT'ER.

APPUCA'HON HLED 02c, 22. 19:9.

1 ,364:,574:. Patented Jan. 4, 1921.

4 SHEEIS-SHEEI l.

R. MOTZNIK.

AUTOMATIC BELT SHIFTER.

APPLICATION'HLED DEC. 22. 1919.

1 364 574L Patented Jan. 4, 1921.

q SHEETS-SHEE1 2.

R. MOTZNIK.

AUTOMAHC BELT SHIFTER.

AFPLICAHON FILED DEC 22. 1919.

Patnted Jan. 4, 1921.

4 SHE E SSHEEI 4.

BEST IiVAIIABLE copy UNITED STATES? PAA'TENT OFFICE.

..: nunonr. norzmx, OFCUYAHOGA FALLS, onro.

.i maosnei December 22,1 1e19'."'-seriai No; 346,635.

To all whom ma ,jco 'eml 3e it known that L BopbLrMoTzNIK, a CItIZGIl of the United States,"residing at devicefor pulleys and is particular "adapt ed for use in connection withihll typesfof machines provided with 1 ,speagedgrttiefi J 1::

, will accomplish the fshiftingof pulleys, "such as cone and The particular objectjof't V therefore is the provisionof de a quick and efiicient manne and;onejwhicfh is I "nithemtypen above set forth] without v necessitating material changes 'h'avingto be made thereon,

Further and moreflimitedobjectsof the invention are in the provision of a device which will facilitate the positive f-a'nd rapid changing ofthe' belt by means of cables instead ofshafts, cams, rods 'andthe like, one which will be simple and cheap of'manufacture, but owing to its particular construction,

efiicient and durable in operation, I

The invention therefore consists of the certain arrangement and attachment of its component parts hereinafter illustrated 1n the drawings, described and specifically pointed out in the accompanying descriptlon and claims. 7

Reference being had to the accompanying drawings in which like reference numerals designate similar parts of reference throughout the various views, ,Figure 1 isca, front elevation of the spindle of a lathe, the counter-shaft being shown as secured to the ceiling and my invention being apphed thereto; Fig. 2 is a transverse sectlon of the same indicated by the line 2-2 of Flg. 1;

' 3 is a plan view of the lathe shown F1 in Tig. 1; Fig. 4 is an enlarged horizontal section through the devicelthe cutting lane being shown at line 4.-4 of Fig. 5; 1g. 5 is an enlarged front elevation of the devlce; Fig. 6 is a sectional detail correspondlng to the line 66 of Fig. 4; Fig. 7 is a sectronal detail on the line 7-7 of Fig. 4: and F 1g. 8 is a diagrammatic view showing the method of rigging the cables.

The device as shown consists of a track 1 which is of channel formation and is secured at one end to a lathe as indicated at 2, and

I0 zannrr smrrnn.

,1. Specification of Letters Patent.

of'thelordinary construction and is the'track supports at one end a sheave 3 at the opposite end a pair of sheaves or I drums tj and 5 about which the cables are passed. Between'the sheaves the track has slidably mounted thereon a casting which will hereinafter be termed'a belt shifter 6,

and said shifterhas extending at right angles to it a plate'7 whi'ch is provided at one end with an opening8, said opening being adapted toreceive'the' belt 9. The shifter 6 s also provided with a depending lip 10 towhi'ch are secured .the ends of one of the cables as byineans of bolts 11 for a purpose to be'hereinafter. described. The sheave 3 is Lournaled upon a stud 1 2 jcarried bythe trac l. The

sheave 4 is supported upon a stud shaft 13 rigidly, finedgnpon-"a'gbracket 114 secured to the track ffljby means of bolts15. This sheavet is iprovided with a'sleeved bearing portlon. or hu"b'16 which extends the full length of the sh'aft 13, and said sleeve has rotatably moun'ted upon it the sheave 5. The sleeve j 16 also has 'mo'unted upon it at its extreme outer end a'cap 17, and said cap iSPIfOVidBQl a clamping device 18 wherebythe same may be fixed against rotation upon 'said sleeve. The sheave 5 and ca 17' are connected "by a coiled spring 19 ed to the sheave 5' at 20 and'its opposite end to the ca 17 at 21. The, cable 22 has one of its en s secured to the lip 10 of the shifter 6 at 23 and then is passed entirely about the sheave 5'and continues over the sheave 3 passing completely about that, and has its other end fixed to the lip 10 at 24:. Thus upon rotation of the sheave 5 by the operating handle 25 the casting or belt'shifter 6. is caused to move longitudinally of the'track 1.

Upon referring to Fig. 1 it will be seen that the bearings 26 of a counter-shaft 27 support a track 28. This track is also channel shaped and has secured to it at one end a sheave 29 and at its opposite end a pair of sheaves 30 and 31. Between the sheaves 29 and 30 the track also has slidably mounted upon it a casting or belt shifting device 32 which is identical in construction with the hereinbefore mentioned shifter 6 and which is for a like purpose. A-cable 33 has one of its ends secured to the shifter 32 andfrom there is led once about the sheave 29, given a quarter turn about the sheave 30 and from there it leads downwardly to the sheave 4, is passed'once about the sheave 4: and then upwardly over the sheave 31 and 25 projection 51 upon the sheave 4 and t 'eregj upoiri 45 erted by the-spring 191m.

tionshown in Figs. 1 and' 5 of the drawings 5 and that it isfdesiredito increase-the speed" i" ,(if th'espindle, $9561 "the""lathe the belt '9 =1wh1'c'hcomes within the scopepf the apn us'tfirstebe'remo through an increasing tension 'of thespriing part of the belt sullicient to cause it! to=bear to the left upon the portion 45'of'the ulley 46. Just prior to the time when the elt is about to leave, the Surface 41' a lug-50 made integral with the sheave 5 enga esa uponthe surface 55 ofthe pulley 46. The tension of the spring 19 is then such as to keep the. cables 22 and. 33 in a relatively fixed p osition to retain! the corresponding 35 shifterstf and 32in the proper position.

said cap in an ariti-clockwise direction and it Will'beseen that the initial movement is then imparted upon the sheave 4 iii ajdiirection to. move the [shifte 13. 32 properly and as beforefan ever increa'mg tension islekthe-sheave 5 wh ich will cause that to mq egthe ;proper' direction: infdue course, aftrth mitted'bythe spring i's take1i u While I-rhave shown'an open. bel

means of connecting thespindle of}. the

lathe i'with the c'ounter-s'haftgit .-is.johvious that -.-a device ..of thi's kindlicojuld be,"applied with. equally efiicient. results upon: a crossed belt, it being understood-thatthe points of engagement of. the 'shi ftersfis and 32 'w ithl the this movement the ten sion of the spring is so controlled as tocause. the shifter 32 to move with a snap"ov'er"to' 3 the left or in a position to carry the belt BEST A A E COPY belt would be adjacent to the points where "the'be'lt"runsbverT-thepulleys, and I do not wish toli nit myself in the position or constructioIr'of-the certain parts further than i's"required*by the state ofthe art or that p nded c a ms-h,

sb l e gaginggnemberajcables con ln'ecte'f; to saidimembefrs',respectively, a pair omheave aroundwhiehthe cables respecs tively pass,-. and'l'a spring "connectiombetween the; sheaves, wherebyzfwhen ohe jis, turnedjthe mation is yieldingly communicated tothe ot 2 A belt e slfiifter comprising a pair of belt engagingmembers movable, laterally to shift. opposite ends of the belt, cables ct-n nectedto said members respectively, a pair of concentric sheaves around. which the cables. respectively pass, and a lost-motion connection between the sheaves, adapted to turn ,either sheaveatter the otheris turned,

szji: lgnnectionijzeoinprising a l'ng on one sheave and a projection on the other sheave adapted??? sffilie sm 3 A belt shifter comprising a pair of beltengaging' membersimovable laterally to shift opposite ends of the belt, cables connected to said members respectively, a pair of sheaves around one of which each of the' cables passes, a spring connection, between the sheaves, whereby when oneis turned tension is placed on the other, and a positive connection between; the sheavesjengageable when the spring is under a certain tension, to positively turn one sheave after the other is turned to a" certain. extent.

4. A,belt shifter-comprisinga pair of belt engagingmembeis movable laterally to shift opp'os" ends offthe belt,cablesconnectedte said; members, respectively, a pair of concentrio sheaves aroundwhich the cables respectivel'v. pass,,,each of said sheaves beingvp'ro- "l gLWg b meeslw teby: nmybe turned. and -agspr ng connection be'tveen the sheaves,

w by w f fe' medi wheel? 

